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SubjectRe: [PATCH] libata: Register for dock events when the drive is inside a dock station
On Tue 04. Mar - 13:12:54, Tejun Heo wrote:
> Holger Macht wrote:
> > On Thu 28. Feb - 19:32:43, Holger Macht wrote:
> >> On Thu 28. Feb - 16:58:17, Holger Macht wrote:
> >>> On Thu 28. Feb - 22:05:53, Tejun Heo wrote:
> >>>> Holger Macht wrote:
> >>>>> On Thu 28. Feb - 18:35:06, Tejun Heo wrote:
> >>>>>> Holger Macht wrote:
> >>>>>>> The hotplug handler is only called if the device is actually inside the
> >>>>>>> dock station. If it is not, nothing will happen. I hope that I got your
> >>>>>>> question right?
> >>>>>> Yes, right.
> >>>>>>
> >>>>>>> However, if this would be helpful, it would be easy to add something like
> >>>>>>> a am_I_on_dock_station?(...) function to the dock driver.
> >>>>>> Hmm.. as long as the event is only delivered when the device is actually
> >>>>>> connected behind dock, I think it's okay.
> >>>>> The dock driver also export a is_dock_device(acpi_handle) function, which
> >>>>> could be used to make more fine-grained decisions, but it shouldn't be
> >>>>> needed here.
> >>>>>
> >>>>>> Does the attached patch fix the previous undock problem? It now
> >>>>>> explicitly tells libata EH to detach the notified devices on
> >>>>>> EJECT_REQUEST and wait for EH to complete such that control is returned
> >>>>>> to ACPI after all notified devices are actually detached.
> >>>>> No it does not. Apparently, it freezes faster (from 1 second down to
> >>>>> immediately). Before, it just froze when someone (in this case HAL) tried
> >>>>> to access the device. The "echo 1 > undock" call does not even return, so
> >>>>> it might have introduced another problem.
> >>>> The code should be in generally right direction. Can you be persuaded
> >>>> into tracking down what's going on?
> >>> I had a quick glance with adding some printk's. Now I got a different
> >>> behaviour once. System did not freeze, but were certainly confused. The
> >>> last thing which got printed to messages was exactly before
> >>> spin_lock_irqsave(ap->lock, flags); at the beginning of ata_acpi_handle_hotplug(...)
> >>>
> >>> The printk immediately after this call didn't come through anymore (with
> >>> being able to use the system for a short time afterwards).
> >> Ok, it seems that there is something broken somewhere else in
> >> 2.6.25.rc3. Not sure at all if it's your patch freezing the machine. I'll
> >> give 2.6.24.3 a try...
> >
> > So once again...
> >
> > After applying your patch, I got the OOPS seen in attachment
> > 'oops-undock-1'. After changing the following, which is hopefully
> > correct...
> >
> > --- ../orig/linux-2.6.24.3/drivers/ata/libata-acpi.c 2008-02-29 00:31:44.000000000 +0100
> > +++ drivers/ata/libata-acpi.c 2008-02-29 00:32:26.000000000 +0100
> > @@ -123,7 +123,7 @@
> > {
> > char event_string[12];
> > char *envp[] = { event_string, NULL };
> > - struct ata_eh_info *ehi = &ap->link.eh_info;
> > + struct ata_eh_info *ehi;
> > struct kobject *kobj = NULL;
> > int wait = 0;
> > unsigned long flags;
> > @@ -131,6 +131,8 @@
> > if (!ap)
> > ap = dev->link->ap;
> >
> > + ehi = &ap->link.eh_info;
> > +
> > spin_lock_irqsave(ap->lock, flags);
> >
> > switch (event) {
> >
> >
> > ...I got both an oops when docking (attachments oops-dock) and when undocking
> > (attachment oops-undock2).
>
> Yeah, that was one mistake. There's another.
>
> +#if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)
> + /* we might be on a docking station */
> + register_hotplug_dock_device(ap->acpi_handle,
> + ata_acpi_dev_notify,
> + ap);
> +#endif
>
> dev_notify is being registered with a pointer to ap. No wonder it causes

It seems this change is missing from your patch. I've attached a fixed
version...

> strange dereferences later on. Attached is the fixed patch. Can you
> please give it a shot?

...and now the good news...the new patch works flawlessly with
2.6.25-rc5...

undocking...
ata5.00: disabled
ata5.00: detaching (SCSI 4:0:0:0)
ACPI: \_SB_.GDCK - undocking
usb 1-6: USB disconnect, address 5

docking...
ACPI: \_SB_.GDCK - docking
ata5: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0xa frozen
ata5: ACPI event
ata5: soft resetting link
ata5.00: ATAPI: HL-DT-ST DVDRAM GSA-4083N, 1.08, max UDMA/33
ata5.00: configured for UDMA/33
ata5: exception Emask 0x10 SAct 0x0 SErr 0x0 action 0x1 t4
ata5: ACPI event
ata5: soft resetting link
ata5.00: configured for UDMA/33
ata5: EH complete
scsi 4:0:0:0: CD-ROM HL-DT-ST DVDRAM GSA-4083N 1.08 PQ: 0 ANSI: 5
sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
sr 4:0:0:0: Attached scsi CD-ROM sr0
sr 4:0:0:0: Attached scsi generic sg1 type 5

Thanks,
Holger
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 9e8ec19..ea01875 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -118,45 +118,77 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}

-static void ata_acpi_handle_hotplug(struct ata_port *ap, struct kobject *kobj,
+static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
u32 event)
{
char event_string[12];
char *envp[] = { event_string, NULL };
- struct ata_eh_info *ehi = &ap->link.eh_info;
-
- if (event == 0 || event == 1) {
- unsigned long flags;
- spin_lock_irqsave(ap->lock, flags);
- ata_ehi_clear_desc(ehi);
- ata_ehi_push_desc(ehi, "ACPI event");
- ata_ehi_hotplugged(ehi);
- ata_port_freeze(ap);
- spin_unlock_irqrestore(ap->lock, flags);
+ struct ata_eh_info *ehi;
+ struct kobject *kobj = NULL;
+ int wait = 0;
+ unsigned long flags;
+
+ if (!ap)
+ ap = dev->link->ap;
+ ehi = &ap->link.eh_info;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ switch (event) {
+ case ACPI_NOTIFY_BUS_CHECK:
+ case ACPI_NOTIFY_DEVICE_CHECK:
+ ata_ehi_push_desc(ehi, "ACPI event");
+ ata_ehi_hotplugged(ehi);
+ ata_port_freeze(ap);
+ break;
+
+ case ACPI_NOTIFY_EJECT_REQUEST:
+ ata_ehi_push_desc(ehi, "ACPI event");
+ if (dev)
+ dev->flags |= ATA_DFLAG_DETACH;
+ else {
+ struct ata_link *tlink;
+ struct ata_device *tdev;
+
+ ata_port_for_each_link(tlink, ap)
+ ata_link_for_each_dev(tdev, tlink)
+ tdev->flags |= ATA_DFLAG_DETACH;
+ }
+
+ ata_port_schedule_eh(ap);
+ wait = 1;
+ break;
}

+ if (dev) {
+ if (dev->sdev)
+ kobj = &dev->sdev->sdev_gendev.kobj;
+ } else
+ kobj = &ap->dev->kobj;
+
if (kobj) {
sprintf(event_string, "BAY_EVENT=%d", event);
kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
}
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ if (wait)
+ ata_port_wait_eh(ap);
}

static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
- struct kobject *kobj = NULL;

- if (dev->sdev)
- kobj = &dev->sdev->sdev_gendev.kobj;
-
- ata_acpi_handle_hotplug(dev->link->ap, kobj, event);
+ ata_acpi_handle_hotplug(NULL, dev, event);
}

static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;

- ata_acpi_handle_hotplug(ap, &ap->dev->kobj, event);
+ ata_acpi_handle_hotplug(ap, NULL, event);
}

/**
@@ -191,20 +223,30 @@ void ata_acpi_associate(struct ata_host *host)
else
ata_acpi_associate_ide_port(ap);

- if (ap->acpi_handle)
- acpi_install_notify_handler (ap->acpi_handle,
- ACPI_SYSTEM_NOTIFY,
- ata_acpi_ap_notify,
- ap);
+ if (ap->acpi_handle) {
+ acpi_install_notify_handler(ap->acpi_handle,
+ ACPI_SYSTEM_NOTIFY,
+ ata_acpi_ap_notify, ap);
+#if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)
+ /* we might be on a docking station */
+ register_hotplug_dock_device(ap->acpi_handle,
+ ata_acpi_ap_notify, ap);
+#endif
+ }

for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
struct ata_device *dev = &ap->link.device[j];

- if (dev->acpi_handle)
- acpi_install_notify_handler (dev->acpi_handle,
- ACPI_SYSTEM_NOTIFY,
- ata_acpi_dev_notify,
- dev);
+ if (dev->acpi_handle) {
+ acpi_install_notify_handler(dev->acpi_handle,
+ ACPI_SYSTEM_NOTIFY,
+ ata_acpi_dev_notify, dev);
+#if defined(CONFIG_ACPI_DOCK) || defined(CONFIG_ACPI_DOCK_MODULE)
+ /* we might be on a docking station */
+ register_hotplug_dock_device(dev->acpi_handle,
+ ata_acpi_dev_notify, dev);
+#endif
+ }
}
}
}
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